string = "Hello World" char = "a" if char in string: print(f"The character '{char}' is found in the string.") else: print(f"The character '{char}' is not found in the string.") 输出结果将是:The character 'a' is not
# 输入字符串string="Hello, world!"# 要查找的字符character="o"# 使用find()方法查找字符在字符串中的位置index=string.find(character)# 输出结果ifindex!=-1:print(f"The character '{character}' is found at index{index}.")else:print(f"The character '{character}' is not found in the string....
Write a Python program to print the index of a character in a string.Sample Solution:Python Code:# Define a string 'str1'. str1 = "w3resource" # Iterate through the characters of the string using enumeration. # 'index' contains the position of the character, and 'char' contains the ch...
#ina givenstring# Initialisingstringini_string1='xyze'# Character to find c="b"# printing initialstringand character print ("initial_strings :", ini_string1,"\ncharacter_to_find :", c) # Using index Methodtry: res=ini_string1.index(c) print ("Character {} in string {} is present ...
underlying string that was assigned to it before. We’re assigning a whole new string with different content. In this case, it was pretty easy to find the index to change as there are few characters in the string.How are we supposed to know which character to change if the string is ...
find('x')-1使用 index()>>> myString = 'Position of a character'>>> myString.index('s')...
方法二:使用index()方法 与find()方法类似,index()方法也可以用来查找字符或字符串在文本中的位置。与find()方法不同的是,如果未找到指定字符或字符串,index()方法会抛出ValueError异常。 代码示例: string="Hello, world!"char="o"try:position=string.index(char)print("The position of '{}' in the strin...
str2='Hello\t999'print str2.expandtabs()#寻找子序列位置,没有找到返回-1,返回了是1print str.find('a')#寻找子序列的位置,没有找到就报错 print str.index('e')#字符串的格式化输出,也就是占位符 age=20name='wuya'print'name is {0},and age is {1}'.format(name,age)#判断是否是字母和数字...
find('World')) # 输出 7 print(s.index('World')) # 输出 7 print(s.rfind("o")) # 输出: 8 print(s.replace('World', 'Python')) # 输出 'Hello, Python!' 6.2 大小写转换 upper():将字符串中的所有字符转换为大写。 lower():将字符串中的所有字符转换为小写。 capitalize():将字符串的...
方法二:使用index()函数 除了find()函数外,Python的字符串对象还提供了另一个类似的函数index(),其用法和find()几乎相同。index()函数的基本用法如下: string.index(substring,start,end) 1. index()函数的参数和返回值与find()函数相同,唯一的区别是,如果找不到子字符串,index()函数会抛出一个异常。